ML19340E479

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LER 80-074/03L-0:on 801210,pilot Valve in Fixed Water Spray Sys Resulted in Control Room Alarm.Caused by Leakage Past Pilot Valve Seat Due to Corrosion & Settling of Sediment from Fire Water.Corrosion Removed
ML19340E479
Person / Time
Site: Fort Saint Vrain Xcel Energy icon.png
Issue date: 01/09/1981
From: Gahm J
PUBLIC SERVICE CO. OF COLORADO
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19340E477 List:
References
LER-80-074-03L, LER-80-74-3L, NUDOCS 8101140646
Download: ML19340E479 (4)
v • d • e


Text

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N*4 )ORM 366 U. S. NUCLE A2 REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l l IPLE ASE PRINT OR TYPE ALL REQUIRED INFORMATIONI e

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7 6 61 NuygER 69 74 'S EVENT CESCRIPTION AND PROSA8LE CONSEQUENCES h loI:l l During normal operation. the fixed water sprav system for the Auxiliary Boiler unnm I g o ,3 ; l vas taken out of service for repair of a pilot vilve. which was causine a nuisance  !

io ;4 l l alarm in the Control Room. This resulted in operation in a degraded mode oernitted I io!3j l by LCO 4.10.5 and is reportable per Fort St. Vrain ""echnical Specification AC 7.5.2(bh2.

I o !61 1 There was no affect on public health or safety. No accompanying occurrence. No re- l l3j,j l lated reports. l l o is t i

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41 Lsj@ W@ I A l6 lo l5 lh 3# 40 42 43 44 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h l i ; o ! l The nuisance alarm was caused by leakage past the pilot valve seat. due to normal l l3 iii l corrosion and settling of sediment from the fire water. The corrosion was removed I

,, ;;, l from the valve and the valve and system were returned to service. Valve is an l

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l REPORT DATE: Januarv 9,1981 REPORTABLE OCCURRENCE 80-074 l ISSUE O OCCURRENCE DATE: December 10, 1980 Page 1 of 3 FmT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WE1D COUNTY ROAD 191/2 PLATTEVILLE, COLORADO 80651 REPORT No. 50-267/80-074/03-L-0 Final l

l IDENTIFICATION OF OCCURRENCE:

A fixed water spray system required to be operable during power operation was removed from service for repair of a pilot valve. This is operation in a degraded mode permitted by LCO 4.10.5 and is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)2.

EVENT DESCRIPTION: ,

l On December 10, 1980, while operating at 69% thermal power and 215 MW elec-trical power, the auxiliary boiler room fixed water spray fire protection system was taken out of service f or repair of a leaky pilot valve, which l was causing a nuisance alarm in the Control Room. The fixed spray system was taken out of service at 1515 hours0.0175 days <br />0.421 hours <br />0.0025 weeks <br />5.764575e-4 months <br /> on December 10, 1980, and returned l co service at 1330 hours0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br /> on December 11, 1980. The areas were inspected on an hourly basis and backup fire fighting equipment was available ad-jacent to the auxiliary boiler room.

CAUSE DESCRIPTION:

See Fi re 1. The nuisance al was caused by water leaking past the pilot valve of the alarm valve . The normal corrosion due to standing water a settling of sediment rom th fire water produced a bad sea that

! allowed leakage past the pilot valve 1 into the retarding chamber 3 and produced the nuisance alarm. Sediment and corrosion were removed from the pilot valve seat and the clapper valve hinge pin ($) .

CORRECTIVE ACTION:

l l The pilot valve was repaired and the fixed water spray system returned to s ervic e, l

i No further corrective action anticipated or required.

l l

REPCRIABLE OCCL*RRENCE 80-07/.

ISSUE O Page 2 of 3

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l REPORTABLE OCCURRENCE 80-074 ISSUE O Pa ge 3 of 3 Prepared By:

Asa B. Reed Technical Services Technician Reviewed By: /

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  1. Technical Services Supervisor Reviewed By:

Frank M. Mathie Operations Manager Approved By: A P m_ b Don '4arembourg gf Manager, Nuclear Production 4

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